rossvikiki rossvikiki
  • 02-02-2017
  • Biology
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how old is a rock that has 70% of it's original K-40

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Аноним Аноним
  • 02-02-2017
The correct answer is 0.2167 billion years old. Hope thsi helps.
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liljunebug17
liljunebug17 liljunebug17
  • 06-02-2017
35% i know that for sure
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